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Mechanical properties of low energy He irradiated 304SS have been investigated by means of tensile test and nano-identation hardness tests. Specimen size is 2.8×5.4×0.1mm in gauge and 12.4mm in total ...length. Specimens are irradiated with 8 keV helium ions at R.T.. 573K and 873K up to the fluence of 3×10^<21> He/m^2. Tensile tests are performed on unirradiated and irradiated specimens at a strain rate of 3.33×10^<-3>/s. In every irradiation condition, one specimen is tested to failure and the other two specimens are strained plastically to 10% and 20%. Formation of blisters with a diameter of about 500 nm is observed on the surface of tensile-tested specimens after R.T. irradiation. Some exfoliation of the blisters is also observed. When the irradiation temperature increases, a large number of cracks with a size of about several μm are formed on the surface together with exfoliation during the tensile test. The yield stress of specimens irradiated at R.T. and 573 K increases about 10% in comparison with that of the unirradiated specimen. The result of nano-indentation tests indicate that hardness near the surface increases depending on the irradiation temperature.show more
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